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Splitting and moving ranges in a distributed system

a distributed database and range technology, applied in the field of large group splitting in a distributed database system, can solve the problem of not uncommonly large splits that exceed the size threshold

Active Publication Date: 2017-11-02
GOOGLE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a way to execute a distributed transaction using a two-phase commit protocol. This protocol ensures that a majority of tablets in each group must commit to the transaction in order to complete it. If there is a vote to abort the transaction, each group undoes the transaction. The technical effect of this is increased efficiency and reliability in executing distributed transactions.

Problems solved by technology

The time and resources required by current repartitioning implementations often cause problems, in particular when trying to split large groups with heavy write loads and as a result, splits that grow many times larger than a size threshold are not uncommon.

Method used

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  • Splitting and moving ranges in a distributed system
  • Splitting and moving ranges in a distributed system
  • Splitting and moving ranges in a distributed system

Examples

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Embodiment Construction

[0014]When repartitioning data in a distributed database, standard implementations copy the entirety of data to be moved. For example, splitting data or changing a replication level requires making a whole new copy of the data in the new configuration. Embodiments described herein provide a mechanism to avoid this extra copy by sharing on-disk copies of the data whenever possible. For example, when splitting data, rather than making a new copy of the two partitions, a virtual view of the existing partition may be provided that makes the existing partition usable as two separate portions. Only when a new copy of the data would otherwise be made, for example when rewriting data into a more compact form (i.e., a “compaction”), does the virtual copy need to be resolved into a real copy of the data. According to certain embodiments, a database is partitioned into groups, where each group is a replicated set of tablets. A tablet includes a list of immutable files, also called layers, and ...

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Abstract

Methods and systems for a distributed transaction in a distributed database system are described. One example includes identifying a request to insert a split point in a source group comprising one or more tablet replicas, each tablet including at least a portion of data from a table in the distributed database system, and the split point splitting data in the source group into a first range and a second range different than the first range; in response to the request: sending a list of filenames in the first range of the source group to a first target group comprising one or more tablet replicas; and creating, at the first target group, a virtual copy of files represented by the list of filenames in the first range, the virtual copy making data of the files available, each using a new name, without duplicating the data of the files.

Description

BACKGROUND[0001]This specification generally relates to splitting large groups in a distributed database system.[0002]When repartitioning data in a distributed database, large chunks of data are often copied to be moved. The time and resources required by current repartitioning implementations often cause problems, in particular when trying to split large groups with heavy write loads and as a result, splits that grow many times larger than a size threshold are not uncommon. Therefore, a need has arisen for a mechanism to quickly and efficiently split large groups in a distributed database.SUMMARY[0003]In general, one aspect of the subject matter described in this specification may be embodied in systems, and methods performed by data processing apparatuses that include actions for a distributed transaction in a distributed database system, including identifying a request to insert a split point in a source group, the source group comprising one or more tablet replicas, each tablet ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F17/30
CPCG06F17/30138G06F17/30575G06F17/30194G06F16/1727G06F16/27G06F16/182G06F16/278
Inventor KANTHAK, SEBASTIANFREY, CLIFFORD ARTHUR
Owner GOOGLE LLC
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